Running an monitoring bitcoind with monit
I recommend adding a user account for bitcoin:
adduser --disabled-login bitcoin
Place the home directory (or at least the .bitcoin/wallet.dat) on an encrypted volume (e.g. cryptsetup). It is also recommended to have a separate wallet for every day use containing only a small amount of coins.
Optional: move your existing .bitcoin directory to the new user and change ownership
sudo mv .bitcoin ~bitcoin; sudo chown -R bitcoin.bitcoin ~bitcoin/.bitcoin
Configure bitcoind in ~bitcoin/bitcoin.conf, you also need to set at least rpcuser and rpcpassword:
Create a wrapper for bitcoind in ~bitcoin/bin/bitcoind
export HOME="/home/bitcoin" exec /path/to/the/real/bitcoind "$@"
Optional: You may want to run bitcoind with a lower priority than your interactive applications:
export HOME="/home/bitcoin" exec /usr/bin/nice /usr/bin/ionice -c 3 /path/to/the/real/bitcoind "$@"
Add the following lines to your monitrc (/etc/monitrc or /etc/monit/monitrc) and reload monit:
check process bitcoind with pidfile /home/bitcoin/.bitcoin/pid start program = "/home/bitcoin/bin/bitcoind -daemon" as uid bitcoin and gid bitcoin stop program = "/home/bitcoin/bin/bitcoind stop" as uid bitcoin and gid bitcoin #if totalmem > 100 MB then restart
If your bitcoind is leaking memory you may want to enable the totalmem check (adjust amount for your needs).